resumo
Hybrid organic/inorganic films composed of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT), with Keggin type polyoxotungstates [SiW(12)O(40)](4-), [SiW(11)O(39)](8-), [SiW(11)Fe(III)(H(2)O)O(39)](5-) or (SiW(11)Co(II)(H(2)O)O(39)](6-) were synthesized by electrochemical polymerization in aqueous solution on the surface of glassy carbon electrodes. Cyclic voltammetry showed that the electrochemical behaviour of the polyoxometalates in the films was very similar to those in solution, and gave evidence of high electrochemical stability. Electrochemical impedance spectroscopy revealed that the charge transfer resistance increased with increasing pH and with more negative potentials. These modified electrodes were found to be very stable and could be used for at least 1 month without significant alterations. (C) 2011 Elsevier B.V. All rights reserved.
palavras-chave
HYBRID MATERIALS POLYPYRROLE/PW12O403; CONDUCTING POLYMERS; ELECTROCATALYTIC REDUCTION; POLYOXOMETALATE COMPLEXES; ELECTROCHROMIC DEVICES; HOMOGENEOUS CATALYSIS; NETWORK FILMS; HETEROPOLYANIONS; POLYANILINE; REDOX
categoria
Chemistry; Electrochemistry
autores
Fernandes, DM; Brett, CMA; Cavaleiro, AMV
nossos autores
Ana Maria Vieira Silva Viana Cavaleiro
Professor CatedráticoGrupos
agradecimentos
The authors thank Fundacao para a Ciencia e a Tecnologia (FCT) for financial support (Project POCI 2010-Feder-POCI/QUI/56534/2004). D. Fernandes acknowledges FCT for her PhD grant SFRH/BD/30797/2006. Thanks are also due to CICECO and the University of Aveiro, and CEMUC (R) (Research Unit 285) University of Coimbra.